Computers can injure(伤害)you. Most other injuries happen suddenly．For example，if you fall off a bike and break your arms, it happens very quickly. But computer injuries happen slowly．
You probably know how to ride a bike safely. Now learn to use a computer safely．
Your eyes
Too much light can injure your eyes, so never sit too close to a computer screen. Your eyes should be more than 50 centimeters from the screen. Don’t forget to look away from it sometimes. This gives your eyes a rest．
When you use a computer, the window should be on your left or your right. If it is behind you, the light will reflect on(反射)the screen. If the window is in front of you，the sun and the screen will both shine into your eyes．
Your hands and wrists(手腕)
Hand and wrist injuries can happen because the hands and wrists are moved in the same way hundreds of times. If you use a keyboard for a long time, follow these three rules: 1) Rest your wrists on something.
2) Keep your elbows(肘)as high as the keyboard.
3) Stop sometimes and exercise your hands, wrists and fingers in a different way．
Your back
Some people sit for many hours in front of a computer. If you sit in the wrong way, you can injure your back or your neck. So you shouldn’t bend your back when you sit. The top part of the screen should be in front of your eyes. Your forearms, wrists, hands and the upper part of your legs should all be parallel(平行)to the floor. If you are sitting for a long time, get up every half an hour and exercise your arms, legs and neck．
Enjoy your computer, but use it safely．
Title: How to use a computer safely
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Different
小题1: of your body
| Causes of the injuries
| Some 小题2: of keeping you away from computer injuries
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Your eyes
| ◆Too much light can injure your eyes
| ◆Don’t sit too close to a computer screen．
◆Your eyes should be 小题3: 50 centimeters from the screen．
◆ 小题4: to look away from the screen sometimes．
|
Your 小题5: and wrists
| ◆You 小题6: them in the same way hundreds of times.
◆You use a keyboard for a long time.
| ◆小题7: your wrists on something.
◆Keep your elbows at the same 小题8: as the keyboard．
◆Exercise your hands, wrists and fingers in different ways．
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Your back
| ◆You sit for many hours 小题9: a computer．
◆ You sit in the wrong way.
| ◆You should keep your back 小题10:when you sit．
◆Get up every half an hour if you are sitting for a
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主题句通常有这样的特点：
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②有阐述控制性概念，偶尔也可在一段中间；
③有的文章无明显主题句，主题句隐含在段意之中。这就需要读者进一步加工概括了。
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①忽视文章的结构；
②混淆了中心与支撑细节或材料的区别；
③忽视文章表意的倾向性；
④漏掉了主要的特征词。
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